ABCD

Example

A
C
C
11
C
B
C
_
C
B
C
_
11
9
15
 
 
A
B
C
_
_
_

Solution

A
C
C
11
C
B
C
12
C
B
C
12
11
9
15
 
 
A
B
C
1
2
5
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ABCD
ABCD

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